Coilover

Types of Coilover

Coilovers are suspension systems made of spring coils that encase the shock absorber. They are primarily used in vehicles to improve their handling and adjust the ride height. There are two main types of coilovers, which include:

• Monotube Coilover: This type of coilover has a single cylindrical shock body. The body holds the nitrogen gas charge and the oil. During the compression stroke, the shock absorber's piston moves down, and the piston rod pulls up. The movement allows the oil and gas to move freely without any disruption. Monotube coilovers offer more consistent performance and respond quickly to changes in the road surface. They are also more accurate and have a larger diameter, which provides more damping force. The coilovers are ideal for racing cars and tracks.
• Twin-Tube Coilover: This type of coilover has two cylindrical shock bodies. The first body holds the nitrogen gas and the oil, while the second body acts as an outer reservoir. The piston and rods are also inside the first and outer second tubes. During the compression stroke, the piston moves down, and the oil is displaced into the outer reservoir. The movement causes the oil level to rise and create pressure in the reservoir. Twin-tube coilovers are more affordable than monotube coilovers. Additionally, they can work on a larger stroke and are less affected by heat. However, they have a delayed response and are ideal for everyday cars and vehicles.

Some coilovers have adjustable features that allow car owners to raise or lower their vehicles. The adjustable coilovers come with either:

• Progressive spring: The coilover has a progressive spring, which coils aren't touching. The distance between the coils allows the spring to compress based on the weight applied to it. Progressive springs provide a smooth ride, are more responsive, and are suitable for cars with adjustable coilovers.
• Linear spring: The coilover has linear springs with coils that are always touching. The distance between the coils remains the same throughout the compression process. Linear springs are harder and provide a bouncy ride. They are suitable for race cars that require a lot of adjustments.

Specification and Maintenance of Coilover

Each coilover suspension has a specification that makes it different from the other. Here are some of the common specifications:

• Spring Rate: The coilover has a spring rate that is measured in pounds per inch or Newtons per millimeter. The spring rate controls how stiff the springs are. Stiff springs give better handling, while softer ones give a comfortable ride. The spring rate on a coilover varies depending on the model. For instance, a coilover for racing applications will have a higher spring rate when compared to a coilover for street applications.
• Shock Absorber Damping: Coilover shocks have dampers with adjustable or non-adjustable damping. Damping controls the absorption of energy from bumps and offers resistance to motion. The coilover shock with adjustable damping allows users to tune the shocks to their preference. The specification of the damping force also varies depending on the application.
• Material: Some coilover shocks are made from aluminum, while others are made from steel. Coilover shocks that are made from aluminum are lightweight and resist corrosion. Those made from steel are more durable.
• Thread Size: Coilover threads come in different sizes. The thread size affects adjustability and compatibility. Common thread sizes range from 12 mm to 24 mm.

Maintaining coilovers is very important if one wants to get the best performance and ride quality. Here is how to maintain coilovers:

• Regular Cleaning: Clean the coilover suspension regularly, especially after driving on dusty roads or winter roads. Use a soft brush to remove dirt and debris, then rinse the coilover with water. Do not use a pressure washer as it can damage some components of the coilover.
• Lubrication: Lubricate the coilover components according to the manufacturer's instructions. Use the recommended lubricant. Pay close attention to the threaded collars and adjusters, as this will ensure smooth operation.
• Inspect the Coilovers: Carry out a visual inspection of the coilovers at regular intervals. Look out for signs of wear, damage, or leakage. Replace worn-out parts immediately to avoid affecting the performance of the coilover suspension.
• Alignment: Get a professional wheel alignment after every 10,000 miles. This is important because the coilover's height adjustment can affect the car's alignment. Proper alignment ensures even tire wear, better handling, and stability.
• Spring and Shock Absorber Replacement: The springs and shock absorbers on the coilovers have a lifespan. Replace them when they wear out or after the manufacturer has recommended replacement.

How to Choose Coilover

There are so many factors to consider when choosing a coilover for a car business. Ultimately, it's about knowing the target customers' needs. Here are some of the things to look out for:

• Car make and model: Consider the car's make, model, and year of production. This information is crucial because it helps select a coilover kit specifically designed for that car.
• Driving style: Understand the customers' driving habits. Do they drive mostly on the roads, or do they participate in track events? For those who drive on the roads, a coilover with a comfortable damping setup is ideal. For track enthusiasts, adjustable coilovers with higher damping rates are more suitable.
• Budget: Determine how much the customers are willing to spend. Coilovers come in a range of prices, so finding one that fits the budget without compromising quality is essential.
• Brand reputation: Research well-known and trusted coilover brands. Read reviews and testimonials to ensure the quality and reliability of the coilovers are chosen.
• Spring rates: Spring rates are key components of coilovers. They affect the car's handling and ride quality. For a balanced experience, choose coilovers with moderate spring rates.
• Damping adjustment: Damping adjustment is a critical feature in coilovers. They allow customization of ride characteristics. If the target customers prefer a firmer or softer ride, select coilovers with adjustable damping.
• Coilover material: Coilovers are made with different materials, including steel and aluminum. Each material has its advantages and disadvantages. Coilovers made of steel are more durable but also heavier. Aluminum coilovers are lighter but may not be as sturdy.
• Installation: Consider the coilover's installation process. Some require advanced skills and special tools, while others are more straightforward. If the target customers want a DIY-friendly coilover, choose one with an easy installation process.

How to Replace Coilover

Replacing coilovers isn't a complex task, but it requires attention to detail and some mechanical knowledge. Here's a step-by-step guide:

Tools Needed

• Jack and jack stands
• Lug wrench
• Socket set
• Wrench set
• Coilover adjustment tool

Steps to Replace Coilover

• 1. Preparation: Park the vehicle on a flat surface. Engage the parking brake and wear wheel chocks.
• 2. Lift the Vehicle: Use the jack to lift the vehicle, then place the jack stands under the vehicle for safety.
• 3. Remove Wheel: Use a lug wrench to remove the wheel where the coilover will be replaced.
• 4. Disengage the Lower Control Arm: Depending on the vehicle, it might be necessary to disengage the lower control arm to remove the coilover.
• 5. Remove the Coilover: Use a socket set and wrench set to loosen and remove the bolts holding the coilover. Pull out the old coilover.
• 6. Install the New Coilover: Slide the new coilover into place and bolt it. Ensure the bolts are tightened to the manufacturer's specifications.
• 7. Reattach the Lower Control Arm: Reattach the lower control arm if it was disengaged.
• 8. Replace the Wheel: Put the wheel back and lower the vehicle.
• 9. Adjust the Coilover: Use the coilover adjustment tool to adjust the height and stiffness according to preferences.

Q and A

Q1: What is the difference between coilovers and conventional suspension setups?

A1: Unlike ordinary suspension systems with fixed-height shock absorbers, coilovers have adjustable shock absorber heights. This feature allows drivers to raise or lower their vehicles' ride height.

Q2: Can anyone adjust coilover suspension?

A2: Even though the coilover suspension system is designed to be adjustable, not all people can or should adjust it. A person with basic mechanical knowledge can make the adjustments. It is advisable to consult a professional mechanic to make the adjustments and attain the desired results.

Q3: Can coilovers be fitted to any car?

A3: Coilovers can be installed in most cars, especially those with front strut suspensions. Cars that don't have strut suspension can also use coilovers, but the installation process is complex. It is worth noting that only a few cars are designed not to accommodate coilovers.

Q4: Do coilovers improve handling?

A4: Yes, coilovers can enhance a car's handling. The adjustable features of the coilovers allow users to fine-tune the vehicle's stability according to different driving conditions. Besides, the coilovers' ability to lower a car's center of gravity boosts its handling.

Q5: How long does it take to adjust coilovers?

A5: The time it takes to adjust coilovers depends on the specific adjustments being made. Minor adjustments, such as preload or damping settings, can be done quickly. Major adjustments, such as ride height or camber, require more time. Coilover adjustments can take anywhere from 30 minutes to a few hours.